Capital Trust Inc. (NYSE: CT) shares climbed 22.8 percent to $2.32 Thursday afternoon. Volume was 657,552, or nearly six times its full-day volume average. CT is a finance and investment management company focused on the commercial real estate industry.

Alcoa Inc. (NYSE: AA) traded in 57,942,316 shares Thursday, more than doubling its daily average. Prices for AA were down 3.4 percent to $15.69, just days after reporting improved revenue and income figures for fiscal 2010.

MSCI Inc. Class A (NYSE: MSCI) plummeted 9.1 percent Thursday to $36.11. Volume for the stock was 1,538,410 shares or three times its full-day average after the investment analysis and market index company said margin growth may slow down in next few quarters as it increases its capital spending.